The Return of Yamaji Hidenori of the famous "Marry Grave"!! The most terrible Overlord in history is challenged by an obviously weak-looking girl... but could she have a secret!?

Many adventurers have finally reached the Overlord's castle. Upon encountering the Overlord, the three strongest adventurers are instantly defeated, leaving everyone in fear. However, one human girl remains calm, and stands before the strongest demon...